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Texas Instruments CD54HC245F
- Part No.:
- CD54HC245F
- Manufacturer:
- Texas Instruments
- Package:
- 20-CDIP (0.300", 7.62mm)
- Datasheet:
-
CD54HC245F.pdf
- Description:
- HIGH SPEED CMOS LOGIC NON-INVERT
- Quantity:
- Payment:
- Shipping:
Inventory:4,916
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Product details
Overview
CD54HC245F from Texas Instruments is a military-grade, high-speed CMOS octal bus transceiver with three-state non-inverting bidirectional operation, 9 ns typical propagation delay at 5 V/15 pF, ±35 mA output drive capability, and -55°C to +125°C operating temperature range-used in avionics data bus isolation and radiation-tolerant backplane interfaces.
For engineers reviewing the CD54HC245F datasheet, CD54HC245F pinout, CD54HC245F application, or CD54HC245F equivalent, this page delivers verified electrical specs, J-package terminal mapping, functional mode truth table, military-qualified thermal and switching characteristics, and direct alternatives for legacy system redesigns requiring extended temperature support.
Technical Context
The CD54HC245F implements dual-control three-state logic with independent DIR (direction) and OE (output enable) inputs governing all eight bidirectional channels simultaneously. Its HC-family core operates from 2 V to 6 V, delivering LSTTL-compatible drive strength while maintaining CMOS-level quiescent current (≤160 µA at 6 V).
Propagation delay (tpd) is specified as 19–28 ns over full temperature range at VCC = 6 V, with matched tPLH/tPHL timing and ≤15 ns output transition time. Input leakage remains ≤±1 µA, and three-state off-leakage (IOZ) is ≤±10 µA across -55°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | HC (High-Speed CMOS), not HCT - supports 2–6 V supply, not TTL-input compatible |
| Propagation Delay (tpd) | 19 ns (min) / 28 ns (max) at VCC = 6 V, CL = 50 pF - enables >30 MHz bus toggle rates |
| Output Drive | ±35 mA per output - sufficient to drive 15 LSTTL loads or ≥50 pF bus capacitance |
| Operating Temperature | -55°C to +125°C - qualified per MIL-PRF-38535 Class B for aerospace and defense systems |
| Supply Voltage Range | 2 V to 6 V - allows interoperability with 3.3 V and 5 V domains without level shifters |
| Three-State Enable Time (ten) | 26–38 ns at VCC = 6 V - ensures deterministic bus arbitration in synchronous backplane designs |
| Input Leakage (II) | ±1 µA max at 6 V - prevents unintended logic state drift in high-impedance control paths |
Pinout & Package
CD54HC245F uses a 20-pin Ceramic Dual In-line Package (CDIP, J package), body size 26.92 mm × 6.92 mm, with through-hole mounting and SNPB (tin-lead) finish. Pin 1 is marked by a beveled corner and located at top-left when notch faces up.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A8 | Input/Output Port A | Bidirectional data lines tied to local subsystem bus; high-impedance when OE = H |
| B1–B8 | Input/Output Port B | Bidirectional data lines tied to remote or shared bus; direction determined by DIR |
| DIR | Direction Control Input | L = B→A transfer; H = A→B transfer; must be stable before OE activation |
| OE | Output Enable Input | L = active transceiver; H = all A/B pins in high-Z - enables bus sharing without contention |
| VCC | Positive Supply | 2–6 V power rail; requires local 0.1 µF ceramic bypass capacitor per device |
| GND | Ground Reference | Signal and power return; must be low-inductance connection to minimize ground bounce |
Key Features
| Feature | Design Value |
|---|---|
| Buffered Inputs | Reduces capacitive loading on upstream drivers and improves noise immunity at A/B ports |
| Three-State Outputs | Enables true bus arbitration: multiple CD54HC245F devices can share one B-bus with no external bus-keeper resistors |
| Wide Voltage Operation | 2–6 V supply range supports mixed-voltage system integration without voltage translation circuitry |
| Military Temperature Range | -55°C to +125°C qualification ensures reliability in engine-mounted controllers and space-qualified payloads |
| Low Power Consumption | ICC ≤ 160 µA at 6 V - reduces thermal load in densely packed avionics chassis vs. LSTTL equivalents |
Applications
| Avionics Data Bus Interface | Spacecraft Onboard Computer Backplane |
|---|---|
|
Use Scenario: Isolating ARINC 429 receiver buffers from flight control processor bus under EMI-heavy cabin conditions. IC Role / Device Role / Timing Role: Bidirectional level-shifting transceiver managing asynchronous command/data flow between dissimilar voltage domains with precise three-state timing control. Use Value: Enables deterministic bus release within 38 ns of OE deassertion, preventing metastability during rapid mode transitions in fly-by-wire systems. |
Use Scenario: Interfacing radiation-hardened FPGA I/O banks to legacy MIL-STD-1553B remote terminal buses in satellite payload modules. IC Role / Device Role / Timing Role: Octal bus driver providing controlled impedance matching and slew-rate-limited outputs compliant with MIL-STD-1553B signal integrity requirements. Use Value: Delivers ±35 mA drive into 50 Ω stubs while maintaining <15 ns transition time - meeting rise/fall time limits for 1 Mbps Manchester-encoded signals. |
| Tactical Vehicle Mission Computer | Nuclear Power Plant Safety PLC |
|
Use Scenario: Connecting ruggedized COTS SBCs to vehicle CAN and discrete I/O expansion cards inside armored vehicle ECU enclosures. IC Role / Device Role / Timing Role: Temperature-stable bus isolator enabling hot-swap-capable modular I/O architecture with zero bus contention during card insertion/removal. Use Value: Guaranteed operation at -55°C ambient allows deployment in unheated forward-deployed vehicles without derating or thermal management overhead. |
Use Scenario: Linking redundant safety-critical controller modules in Class 1E nuclear instrumentation and control systems where long-term parametric stability is mandated. IC Role / Device Role / Timing Role: Radiation-tolerant bidirectional data coupler ensuring deterministic fail-safe bus isolation during neutron flux events. Use Value: Qualified to MIL-PRF-38535 Class B with lot traceability and burn-in - satisfies NRC regulatory requirement for 60-year component lifetime assurance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal three-state transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD54HCT245F | HCT logic family: 4.5–5.5 V only; TTL-compatible inputs (VIL ≤ 0.8 V, VIH ≥ 2 V); identical pinout and timing | Required where legacy LSTTL control logic drives DIR/OE; unsuitable for 3.3 V or wide-supply systems | Select CD54HCT245F only if interfacing directly to 5 V TTL sources; otherwise CD54HC245F offers broader supply flexibility. |
| SNJ54HC245FK | Identical HC logic, same J-package, but manufactured under different TI military specification (MIL-M-38510); RoHS-exempt tin-lead finish | Approved for use in DoD contracts requiring MIL-M-38510 compliance rather than MIL-PRF-38535 | Choose SNJ54HC245FK when contract documentation mandates MIL-M-38510 qualification; CD54HC245F meets newer MIL-PRF-38535 Class B. |
Compared with CD54HCT245F and SNJ54HC245FK, the CD54HC245F uniquely supports 2–6 V operation and is qualified under MIL-PRF-38535 Class B - making it the only option for mixed-voltage military systems requiring extended temperature margin and modern process control.
Availability
CD54HC245F is available at Aetrix Electronics and suitable for avionics data bus interface, spacecraft onboard computer backplane, and nuclear safety PLC applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD54HC245F includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a U.S.-based semiconductor manufacturer specializing in analog, embedded processing, and high-reliability components for industrial, automotive, and defense markets.
The CD54HC245F belongs to TI's military-grade HC logic product line, designed specifically for high-integrity systems demanding guaranteed performance across extreme environmental stress and multi-decade service life.
FAQ
What is the maximum clock frequency supported by CD54HC245F in a bidirectional data path?
The CD54HC245F does not operate on a clock; it is a combinational transceiver. Its usable data rate depends on propagation delay and bus loading. With 19–28 ns tpd at VCC = 6 V and CL = 50 pF, the CD54HC245F supports reliable bidirectional toggling up to approximately 30 MHz on lightly loaded buses. System-level timing must account for both tpd and three-state enable/disable delays.
Does CD54HC245F support 3.3 V operation, and what are the implications for input thresholds?
Yes, CD54HC245F supports 3.3 V operation per its 2–6 V supply range. At VCC = 3.3 V, VIH(min) = 2.1 V and VIL(max) = 1.1 V (derived from 70%/30% VCC ratios). This ensures compatibility with standard 3.3 V CMOS logic families without level shifting, unlike the HCT variant which requires 4.5–5.5 V.
How does the CD54HC245F handle simultaneous assertion of DIR and OE inputs?
When OE is high (H), all A and B pins enter high-impedance regardless of DIR state - DIR has no effect. When OE is low (L), DIR determines direction: DIR = L enables B→A transfer; DIR = H enables A→B transfer. The CD54HC245F truth table explicitly defines these functional modes, and no contention occurs due to internal three-state gating.
Is CD54HC245F pin-compatible with CD74HC245E, and what are the key mechanical differences?
Yes, CD54HC245F (J-package, 20-pin CDIP) and CD74HC245E (N-package, 20-pin PDIP) share identical pinout and logic function. Mechanically, CD54HC245F uses ceramic body with metal lid and SNPB finish (non-RoHS), rated for -55°C to +125°C; CD74HC245E uses plastic body with matte tin finish (RoHS-compliant), rated for -55°C to +125°C but not qualified to MIL-PRF-38535.
What thermal derating applies to CD54HC245F at maximum junction temperature?
CD54HC245F has no published RθJA for the J-package in the datasheet, but its absolute maximum junction temperature is 150°C. Derating begins at TJ > 125°C: output current must be reduced linearly to zero at 150°C. For continuous operation at +125°C ambient, ensure PCB copper area and airflow limit power dissipation such that TJ ≤ 125°C - typically requiring <10 mW per channel at full drive.
CD54HC245F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54HC
- Package/Case:
- 20-CDIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 5.2mA, 5.2mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-CDIP
CD54HC245F FAQ
1.How can I place an order for CD54HC245F through Aetrix?
Please submit a Request for Quotation (RFQ) for CD54HC245F on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for CD54HC245F reliable?
The price and inventory of CD54HC245F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD54HC245F is usually 5 days.
3.What payment methods are accepted for CD54HC245F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD54HC245F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD54HC245F?
CD54HC245F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD54HC245F order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for CD54HC245F?
For technical support, including CD54HC245F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD54HC245F requirements.
6.How does Aetrix verify that CD54HC245F is sourced from the original manufacturer or authorized distributors?
All CD54HC245F products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that CD54HC245F meets industry standards.
7.What is the process for return or replacement of CD54HC245F?
All CD54HC245F units undergo pre-shipment inspection (PSI). If there is an issue with CD54HC245F, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The CD54HC245F part is unused and in its original packaging.
Return procedure for CD54HC245F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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